Express Skeleton

[ness13]

Not sure on the last few.

10a. Swell student making a sound ??O?L
3d. Reduced gaps are barmy G??A
7d. Real troublemaker's first regret ?R?E
17d. Hazardous state? Heavens! R?S?Y - is it RISKY?

[Sam1960]

3. gaga
7. true

[Mamyalynne]

10 Grow L

3 Gaga

7 T Rue

17 RI Sky

[ness13]

Thank you, both.